Hearing aid



FIG. 1 is a perspective view of a hearing aid showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a perspective view thereof in a configuration when used.

The broken lines depict portions of the hearing aid in which the design is embodied that form no part of the claimed design. 

CLAIM The ornamental design for a hearing aid, as shown and described. 